To Dollar-ize or not to Dollar-ize?

That is the (really a) question. The word I'm hearing regarding existing LETS systems is that for convenience's sake they're usually pegged at a fixed rate to whatever the national currency is. Like many issues regarding currency, the advantages of this are obvious, but I personally feel there are also non-obvious detriments to this fixed pegging and believe we can find a way to do without it. For example, a LETS system pegged to the national currency would still enjoy the lack of scarcity common in many national currencies sure, but wouldn't it then also be subject to inflation or deflation of the existing hours on the ledger beyond the control of the members? A solution I propose is to create a free floating exchange rate as we go, with-and-by the consent of the members, one way it can be done is like this: When members enter into a transaction in hours, they are asked to value the hours portion of their trade, item or service in dollars too. We can possibly create fields for this, whatever we like and can manage, buyer only, buyer and seller's estimates singly or averaged together, whatever we like. This valuation is done with the consent of the parties involved, when you go to a restaurant and spend hours you accept their "exchange valuation" or you decide not to go, when you accept and create the transaction this becomes part of the defining of the exchange rate, the exchange rate - really just a meter of the decisions of the members - is created by the combination of all these decisions together. This rate, current and historic, can be graphed and posted right on the site for reference. In a way there is no official "existing exchange rate", only a record of what it's been in the market. I think this is a cool and featureful aspect to create for sure, but much more importantly, it keeps the Hour freely consensual, truly independent, and can-do. I'm very interested to know y'all's thoughts~ Allen